10abdde82SPaolo Abeni // SPDX-License-Identifier: GPL-2.0 20abdde82SPaolo Abeni /* Multipath TCP 30abdde82SPaolo Abeni * 40abdde82SPaolo Abeni * Copyright (c) 2021, Red Hat. 50abdde82SPaolo Abeni */ 60abdde82SPaolo Abeni 70abdde82SPaolo Abeni #define pr_fmt(fmt) "MPTCP: " fmt 80abdde82SPaolo Abeni 90abdde82SPaolo Abeni #include <linux/kernel.h> 100abdde82SPaolo Abeni #include <linux/module.h> 110abdde82SPaolo Abeni #include <net/sock.h> 120abdde82SPaolo Abeni #include <net/protocol.h> 130abdde82SPaolo Abeni #include <net/tcp.h> 140abdde82SPaolo Abeni #include <net/mptcp.h> 150abdde82SPaolo Abeni #include "protocol.h" 160abdde82SPaolo Abeni 1706f15ceeSFlorian Westphal #define MIN_INFO_OPTLEN_SIZE 16 1806f15ceeSFlorian Westphal 190abdde82SPaolo Abeni static struct sock *__mptcp_tcp_fallback(struct mptcp_sock *msk) 200abdde82SPaolo Abeni { 210abdde82SPaolo Abeni sock_owned_by_me((const struct sock *)msk); 220abdde82SPaolo Abeni 230abdde82SPaolo Abeni if (likely(!__mptcp_check_fallback(msk))) 240abdde82SPaolo Abeni return NULL; 250abdde82SPaolo Abeni 260abdde82SPaolo Abeni return msk->first; 270abdde82SPaolo Abeni } 280abdde82SPaolo Abeni 29df00b087SFlorian Westphal static u32 sockopt_seq_reset(const struct sock *sk) 30df00b087SFlorian Westphal { 31df00b087SFlorian Westphal sock_owned_by_me(sk); 32df00b087SFlorian Westphal 33df00b087SFlorian Westphal /* Highbits contain state. Allows to distinguish sockopt_seq 34df00b087SFlorian Westphal * of listener and established: 35df00b087SFlorian Westphal * s0 = new_listener() 36df00b087SFlorian Westphal * sockopt(s0) - seq is 1 37df00b087SFlorian Westphal * s1 = accept(s0) - s1 inherits seq 1 if listener sk (s0) 38df00b087SFlorian Westphal * sockopt(s0) - seq increments to 2 on s0 39df00b087SFlorian Westphal * sockopt(s1) // seq increments to 2 on s1 (different option) 40df00b087SFlorian Westphal * new ssk completes join, inherits options from s0 // seq 2 41df00b087SFlorian Westphal * Needs sync from mptcp join logic, but ssk->seq == msk->seq 42df00b087SFlorian Westphal * 43df00b087SFlorian Westphal * Set High order bits to sk_state so ssk->seq == msk->seq test 44df00b087SFlorian Westphal * will fail. 45df00b087SFlorian Westphal */ 46df00b087SFlorian Westphal 47df00b087SFlorian Westphal return (u32)sk->sk_state << 24u; 48df00b087SFlorian Westphal } 49df00b087SFlorian Westphal 501b3e7edeSFlorian Westphal static void sockopt_seq_inc(struct mptcp_sock *msk) 511b3e7edeSFlorian Westphal { 521b3e7edeSFlorian Westphal u32 seq = (msk->setsockopt_seq + 1) & 0x00ffffff; 531b3e7edeSFlorian Westphal 541b3e7edeSFlorian Westphal msk->setsockopt_seq = sockopt_seq_reset((struct sock *)msk) + seq; 551b3e7edeSFlorian Westphal } 561b3e7edeSFlorian Westphal 571b3e7edeSFlorian Westphal static int mptcp_get_int_option(struct mptcp_sock *msk, sockptr_t optval, 581b3e7edeSFlorian Westphal unsigned int optlen, int *val) 591b3e7edeSFlorian Westphal { 601b3e7edeSFlorian Westphal if (optlen < sizeof(int)) 611b3e7edeSFlorian Westphal return -EINVAL; 621b3e7edeSFlorian Westphal 631b3e7edeSFlorian Westphal if (copy_from_sockptr(val, optval, sizeof(*val))) 641b3e7edeSFlorian Westphal return -EFAULT; 651b3e7edeSFlorian Westphal 661b3e7edeSFlorian Westphal return 0; 671b3e7edeSFlorian Westphal } 681b3e7edeSFlorian Westphal 691b3e7edeSFlorian Westphal static void mptcp_sol_socket_sync_intval(struct mptcp_sock *msk, int optname, int val) 701b3e7edeSFlorian Westphal { 711b3e7edeSFlorian Westphal struct mptcp_subflow_context *subflow; 721b3e7edeSFlorian Westphal struct sock *sk = (struct sock *)msk; 731b3e7edeSFlorian Westphal 741b3e7edeSFlorian Westphal lock_sock(sk); 751b3e7edeSFlorian Westphal sockopt_seq_inc(msk); 761b3e7edeSFlorian Westphal 771b3e7edeSFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 781b3e7edeSFlorian Westphal struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 791b3e7edeSFlorian Westphal bool slow = lock_sock_fast(ssk); 801b3e7edeSFlorian Westphal 811b3e7edeSFlorian Westphal switch (optname) { 82a03c99b2SFlorian Westphal case SO_DEBUG: 83a03c99b2SFlorian Westphal sock_valbool_flag(ssk, SOCK_DBG, !!val); 84a03c99b2SFlorian Westphal break; 851b3e7edeSFlorian Westphal case SO_KEEPALIVE: 861b3e7edeSFlorian Westphal if (ssk->sk_prot->keepalive) 871b3e7edeSFlorian Westphal ssk->sk_prot->keepalive(ssk, !!val); 881b3e7edeSFlorian Westphal sock_valbool_flag(ssk, SOCK_KEEPOPEN, !!val); 891b3e7edeSFlorian Westphal break; 901b3e7edeSFlorian Westphal case SO_PRIORITY: 911b3e7edeSFlorian Westphal ssk->sk_priority = val; 921b3e7edeSFlorian Westphal break; 935d0a6bc8SFlorian Westphal case SO_SNDBUF: 945d0a6bc8SFlorian Westphal case SO_SNDBUFFORCE: 955d0a6bc8SFlorian Westphal ssk->sk_userlocks |= SOCK_SNDBUF_LOCK; 965d0a6bc8SFlorian Westphal WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf); 975d0a6bc8SFlorian Westphal break; 985d0a6bc8SFlorian Westphal case SO_RCVBUF: 995d0a6bc8SFlorian Westphal case SO_RCVBUFFORCE: 1005d0a6bc8SFlorian Westphal ssk->sk_userlocks |= SOCK_RCVBUF_LOCK; 1015d0a6bc8SFlorian Westphal WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf); 1025d0a6bc8SFlorian Westphal break; 10336704413SFlorian Westphal case SO_MARK: 10436704413SFlorian Westphal if (READ_ONCE(ssk->sk_mark) != sk->sk_mark) { 10536704413SFlorian Westphal ssk->sk_mark = sk->sk_mark; 10636704413SFlorian Westphal sk_dst_reset(ssk); 10736704413SFlorian Westphal } 10836704413SFlorian Westphal break; 1096f0d7198SFlorian Westphal case SO_INCOMING_CPU: 1106f0d7198SFlorian Westphal WRITE_ONCE(ssk->sk_incoming_cpu, val); 1116f0d7198SFlorian Westphal break; 1121b3e7edeSFlorian Westphal } 1131b3e7edeSFlorian Westphal 1141b3e7edeSFlorian Westphal subflow->setsockopt_seq = msk->setsockopt_seq; 1151b3e7edeSFlorian Westphal unlock_sock_fast(ssk, slow); 1161b3e7edeSFlorian Westphal } 1171b3e7edeSFlorian Westphal 1181b3e7edeSFlorian Westphal release_sock(sk); 1191b3e7edeSFlorian Westphal } 1201b3e7edeSFlorian Westphal 1211b3e7edeSFlorian Westphal static int mptcp_sol_socket_intval(struct mptcp_sock *msk, int optname, int val) 1221b3e7edeSFlorian Westphal { 1231b3e7edeSFlorian Westphal sockptr_t optval = KERNEL_SOCKPTR(&val); 1241b3e7edeSFlorian Westphal struct sock *sk = (struct sock *)msk; 1251b3e7edeSFlorian Westphal int ret; 1261b3e7edeSFlorian Westphal 1271b3e7edeSFlorian Westphal ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, 1281b3e7edeSFlorian Westphal optval, sizeof(val)); 1291b3e7edeSFlorian Westphal if (ret) 1301b3e7edeSFlorian Westphal return ret; 1311b3e7edeSFlorian Westphal 1321b3e7edeSFlorian Westphal mptcp_sol_socket_sync_intval(msk, optname, val); 1331b3e7edeSFlorian Westphal return 0; 1341b3e7edeSFlorian Westphal } 1351b3e7edeSFlorian Westphal 1366f0d7198SFlorian Westphal static void mptcp_so_incoming_cpu(struct mptcp_sock *msk, int val) 1376f0d7198SFlorian Westphal { 1386f0d7198SFlorian Westphal struct sock *sk = (struct sock *)msk; 1396f0d7198SFlorian Westphal 1406f0d7198SFlorian Westphal WRITE_ONCE(sk->sk_incoming_cpu, val); 1416f0d7198SFlorian Westphal 1426f0d7198SFlorian Westphal mptcp_sol_socket_sync_intval(msk, SO_INCOMING_CPU, val); 1436f0d7198SFlorian Westphal } 1446f0d7198SFlorian Westphal 1459061f24bSFlorian Westphal static int mptcp_setsockopt_sol_socket_tstamp(struct mptcp_sock *msk, int optname, int val) 1469061f24bSFlorian Westphal { 1479061f24bSFlorian Westphal sockptr_t optval = KERNEL_SOCKPTR(&val); 1489061f24bSFlorian Westphal struct mptcp_subflow_context *subflow; 1499061f24bSFlorian Westphal struct sock *sk = (struct sock *)msk; 1509061f24bSFlorian Westphal int ret; 1519061f24bSFlorian Westphal 1529061f24bSFlorian Westphal ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, 1539061f24bSFlorian Westphal optval, sizeof(val)); 1549061f24bSFlorian Westphal if (ret) 1559061f24bSFlorian Westphal return ret; 1569061f24bSFlorian Westphal 1579061f24bSFlorian Westphal lock_sock(sk); 1589061f24bSFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 1599061f24bSFlorian Westphal struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1609061f24bSFlorian Westphal bool slow = lock_sock_fast(ssk); 1619061f24bSFlorian Westphal 1629061f24bSFlorian Westphal sock_set_timestamp(sk, optname, !!val); 1639061f24bSFlorian Westphal unlock_sock_fast(ssk, slow); 1649061f24bSFlorian Westphal } 1659061f24bSFlorian Westphal 1669061f24bSFlorian Westphal release_sock(sk); 1679061f24bSFlorian Westphal return 0; 1689061f24bSFlorian Westphal } 1699061f24bSFlorian Westphal 1701b3e7edeSFlorian Westphal static int mptcp_setsockopt_sol_socket_int(struct mptcp_sock *msk, int optname, 1716c9a0a0fSYangbo Lu sockptr_t optval, 1726c9a0a0fSYangbo Lu unsigned int optlen) 1731b3e7edeSFlorian Westphal { 1741b3e7edeSFlorian Westphal int val, ret; 1751b3e7edeSFlorian Westphal 1761b3e7edeSFlorian Westphal ret = mptcp_get_int_option(msk, optval, optlen, &val); 1771b3e7edeSFlorian Westphal if (ret) 1781b3e7edeSFlorian Westphal return ret; 1791b3e7edeSFlorian Westphal 1801b3e7edeSFlorian Westphal switch (optname) { 1811b3e7edeSFlorian Westphal case SO_KEEPALIVE: 1821b3e7edeSFlorian Westphal mptcp_sol_socket_sync_intval(msk, optname, val); 1831b3e7edeSFlorian Westphal return 0; 184a03c99b2SFlorian Westphal case SO_DEBUG: 18536704413SFlorian Westphal case SO_MARK: 1861b3e7edeSFlorian Westphal case SO_PRIORITY: 1875d0a6bc8SFlorian Westphal case SO_SNDBUF: 1885d0a6bc8SFlorian Westphal case SO_SNDBUFFORCE: 1895d0a6bc8SFlorian Westphal case SO_RCVBUF: 1905d0a6bc8SFlorian Westphal case SO_RCVBUFFORCE: 1911b3e7edeSFlorian Westphal return mptcp_sol_socket_intval(msk, optname, val); 1926f0d7198SFlorian Westphal case SO_INCOMING_CPU: 1936f0d7198SFlorian Westphal mptcp_so_incoming_cpu(msk, val); 1946f0d7198SFlorian Westphal return 0; 1959061f24bSFlorian Westphal case SO_TIMESTAMP_OLD: 1969061f24bSFlorian Westphal case SO_TIMESTAMP_NEW: 1979061f24bSFlorian Westphal case SO_TIMESTAMPNS_OLD: 1989061f24bSFlorian Westphal case SO_TIMESTAMPNS_NEW: 1999061f24bSFlorian Westphal return mptcp_setsockopt_sol_socket_tstamp(msk, optname, val); 2001b3e7edeSFlorian Westphal } 2011b3e7edeSFlorian Westphal 2021b3e7edeSFlorian Westphal return -ENOPROTOOPT; 2031b3e7edeSFlorian Westphal } 2041b3e7edeSFlorian Westphal 2056c9a0a0fSYangbo Lu static int mptcp_setsockopt_sol_socket_timestamping(struct mptcp_sock *msk, 2066c9a0a0fSYangbo Lu int optname, 2076c9a0a0fSYangbo Lu sockptr_t optval, 2086c9a0a0fSYangbo Lu unsigned int optlen) 2096c9a0a0fSYangbo Lu { 2106c9a0a0fSYangbo Lu struct mptcp_subflow_context *subflow; 2116c9a0a0fSYangbo Lu struct sock *sk = (struct sock *)msk; 212d463126eSYangbo Lu struct so_timestamping timestamping; 213d463126eSYangbo Lu int ret; 2146c9a0a0fSYangbo Lu 215d463126eSYangbo Lu if (optlen == sizeof(timestamping)) { 216d463126eSYangbo Lu if (copy_from_sockptr(×tamping, optval, 217d463126eSYangbo Lu sizeof(timestamping))) 218d463126eSYangbo Lu return -EFAULT; 219d463126eSYangbo Lu } else if (optlen == sizeof(int)) { 220d463126eSYangbo Lu memset(×tamping, 0, sizeof(timestamping)); 221d463126eSYangbo Lu 222d463126eSYangbo Lu if (copy_from_sockptr(×tamping.flags, optval, sizeof(int))) 223d463126eSYangbo Lu return -EFAULT; 224d463126eSYangbo Lu } else { 225d463126eSYangbo Lu return -EINVAL; 226d463126eSYangbo Lu } 2276c9a0a0fSYangbo Lu 2286c9a0a0fSYangbo Lu ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, 229d463126eSYangbo Lu KERNEL_SOCKPTR(×tamping), 230d463126eSYangbo Lu sizeof(timestamping)); 2316c9a0a0fSYangbo Lu if (ret) 2326c9a0a0fSYangbo Lu return ret; 2336c9a0a0fSYangbo Lu 2346c9a0a0fSYangbo Lu lock_sock(sk); 2356c9a0a0fSYangbo Lu 2366c9a0a0fSYangbo Lu mptcp_for_each_subflow(msk, subflow) { 2376c9a0a0fSYangbo Lu struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 2386c9a0a0fSYangbo Lu bool slow = lock_sock_fast(ssk); 2396c9a0a0fSYangbo Lu 240d463126eSYangbo Lu sock_set_timestamping(sk, optname, timestamping); 2416c9a0a0fSYangbo Lu unlock_sock_fast(ssk, slow); 2426c9a0a0fSYangbo Lu } 2436c9a0a0fSYangbo Lu 2446c9a0a0fSYangbo Lu release_sock(sk); 2456c9a0a0fSYangbo Lu 2466c9a0a0fSYangbo Lu return 0; 2476c9a0a0fSYangbo Lu } 2486c9a0a0fSYangbo Lu 249268b1238SFlorian Westphal static int mptcp_setsockopt_sol_socket_linger(struct mptcp_sock *msk, sockptr_t optval, 250268b1238SFlorian Westphal unsigned int optlen) 251268b1238SFlorian Westphal { 252268b1238SFlorian Westphal struct mptcp_subflow_context *subflow; 253268b1238SFlorian Westphal struct sock *sk = (struct sock *)msk; 254268b1238SFlorian Westphal struct linger ling; 255268b1238SFlorian Westphal sockptr_t kopt; 256268b1238SFlorian Westphal int ret; 257268b1238SFlorian Westphal 258268b1238SFlorian Westphal if (optlen < sizeof(ling)) 259268b1238SFlorian Westphal return -EINVAL; 260268b1238SFlorian Westphal 261268b1238SFlorian Westphal if (copy_from_sockptr(&ling, optval, sizeof(ling))) 262268b1238SFlorian Westphal return -EFAULT; 263268b1238SFlorian Westphal 264268b1238SFlorian Westphal kopt = KERNEL_SOCKPTR(&ling); 265268b1238SFlorian Westphal ret = sock_setsockopt(sk->sk_socket, SOL_SOCKET, SO_LINGER, kopt, sizeof(ling)); 266268b1238SFlorian Westphal if (ret) 267268b1238SFlorian Westphal return ret; 268268b1238SFlorian Westphal 269268b1238SFlorian Westphal lock_sock(sk); 270268b1238SFlorian Westphal sockopt_seq_inc(msk); 271268b1238SFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 272268b1238SFlorian Westphal struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 273268b1238SFlorian Westphal bool slow = lock_sock_fast(ssk); 274268b1238SFlorian Westphal 275268b1238SFlorian Westphal if (!ling.l_onoff) { 276268b1238SFlorian Westphal sock_reset_flag(ssk, SOCK_LINGER); 277268b1238SFlorian Westphal } else { 278268b1238SFlorian Westphal ssk->sk_lingertime = sk->sk_lingertime; 279268b1238SFlorian Westphal sock_set_flag(ssk, SOCK_LINGER); 280268b1238SFlorian Westphal } 281268b1238SFlorian Westphal 282268b1238SFlorian Westphal subflow->setsockopt_seq = msk->setsockopt_seq; 283268b1238SFlorian Westphal unlock_sock_fast(ssk, slow); 284268b1238SFlorian Westphal } 285268b1238SFlorian Westphal 286268b1238SFlorian Westphal release_sock(sk); 287268b1238SFlorian Westphal return 0; 288268b1238SFlorian Westphal } 289268b1238SFlorian Westphal 2900abdde82SPaolo Abeni static int mptcp_setsockopt_sol_socket(struct mptcp_sock *msk, int optname, 2910abdde82SPaolo Abeni sockptr_t optval, unsigned int optlen) 2920abdde82SPaolo Abeni { 2930abdde82SPaolo Abeni struct sock *sk = (struct sock *)msk; 2940abdde82SPaolo Abeni struct socket *ssock; 2950abdde82SPaolo Abeni int ret; 2960abdde82SPaolo Abeni 2970abdde82SPaolo Abeni switch (optname) { 2980abdde82SPaolo Abeni case SO_REUSEPORT: 2990abdde82SPaolo Abeni case SO_REUSEADDR: 3005d0a6bc8SFlorian Westphal case SO_BINDTODEVICE: 3015d0a6bc8SFlorian Westphal case SO_BINDTOIFINDEX: 3020abdde82SPaolo Abeni lock_sock(sk); 3030abdde82SPaolo Abeni ssock = __mptcp_nmpc_socket(msk); 3040abdde82SPaolo Abeni if (!ssock) { 3050abdde82SPaolo Abeni release_sock(sk); 3060abdde82SPaolo Abeni return -EINVAL; 3070abdde82SPaolo Abeni } 3080abdde82SPaolo Abeni 3090abdde82SPaolo Abeni ret = sock_setsockopt(ssock, SOL_SOCKET, optname, optval, optlen); 3100abdde82SPaolo Abeni if (ret == 0) { 3110abdde82SPaolo Abeni if (optname == SO_REUSEPORT) 3120abdde82SPaolo Abeni sk->sk_reuseport = ssock->sk->sk_reuseport; 3130abdde82SPaolo Abeni else if (optname == SO_REUSEADDR) 3140abdde82SPaolo Abeni sk->sk_reuse = ssock->sk->sk_reuse; 3155d0a6bc8SFlorian Westphal else if (optname == SO_BINDTODEVICE) 3165d0a6bc8SFlorian Westphal sk->sk_bound_dev_if = ssock->sk->sk_bound_dev_if; 3175d0a6bc8SFlorian Westphal else if (optname == SO_BINDTOIFINDEX) 3185d0a6bc8SFlorian Westphal sk->sk_bound_dev_if = ssock->sk->sk_bound_dev_if; 3190abdde82SPaolo Abeni } 3200abdde82SPaolo Abeni release_sock(sk); 3210abdde82SPaolo Abeni return ret; 3221b3e7edeSFlorian Westphal case SO_KEEPALIVE: 3231b3e7edeSFlorian Westphal case SO_PRIORITY: 3245d0a6bc8SFlorian Westphal case SO_SNDBUF: 3255d0a6bc8SFlorian Westphal case SO_SNDBUFFORCE: 3265d0a6bc8SFlorian Westphal case SO_RCVBUF: 3275d0a6bc8SFlorian Westphal case SO_RCVBUFFORCE: 32836704413SFlorian Westphal case SO_MARK: 3296f0d7198SFlorian Westphal case SO_INCOMING_CPU: 330a03c99b2SFlorian Westphal case SO_DEBUG: 3319061f24bSFlorian Westphal case SO_TIMESTAMP_OLD: 3329061f24bSFlorian Westphal case SO_TIMESTAMP_NEW: 3339061f24bSFlorian Westphal case SO_TIMESTAMPNS_OLD: 3349061f24bSFlorian Westphal case SO_TIMESTAMPNS_NEW: 3356c9a0a0fSYangbo Lu return mptcp_setsockopt_sol_socket_int(msk, optname, optval, 3366c9a0a0fSYangbo Lu optlen); 3379061f24bSFlorian Westphal case SO_TIMESTAMPING_OLD: 3389061f24bSFlorian Westphal case SO_TIMESTAMPING_NEW: 3396c9a0a0fSYangbo Lu return mptcp_setsockopt_sol_socket_timestamping(msk, optname, 3406c9a0a0fSYangbo Lu optval, optlen); 341268b1238SFlorian Westphal case SO_LINGER: 342268b1238SFlorian Westphal return mptcp_setsockopt_sol_socket_linger(msk, optval, optlen); 3437a009a70SFlorian Westphal case SO_RCVLOWAT: 3447a009a70SFlorian Westphal case SO_RCVTIMEO_OLD: 3457a009a70SFlorian Westphal case SO_RCVTIMEO_NEW: 3467a009a70SFlorian Westphal case SO_BUSY_POLL: 3477a009a70SFlorian Westphal case SO_PREFER_BUSY_POLL: 3487a009a70SFlorian Westphal case SO_BUSY_POLL_BUDGET: 3497a009a70SFlorian Westphal /* No need to copy: only relevant for msk */ 3507a009a70SFlorian Westphal return sock_setsockopt(sk->sk_socket, SOL_SOCKET, optname, optval, optlen); 351a03c99b2SFlorian Westphal case SO_NO_CHECK: 352a03c99b2SFlorian Westphal case SO_DONTROUTE: 353a03c99b2SFlorian Westphal case SO_BROADCAST: 354a03c99b2SFlorian Westphal case SO_BSDCOMPAT: 355a03c99b2SFlorian Westphal case SO_PASSCRED: 356a03c99b2SFlorian Westphal case SO_PASSSEC: 357a03c99b2SFlorian Westphal case SO_RXQ_OVFL: 358a03c99b2SFlorian Westphal case SO_WIFI_STATUS: 359a03c99b2SFlorian Westphal case SO_NOFCS: 360a03c99b2SFlorian Westphal case SO_SELECT_ERR_QUEUE: 361a03c99b2SFlorian Westphal return 0; 3620abdde82SPaolo Abeni } 3630abdde82SPaolo Abeni 3647a009a70SFlorian Westphal /* SO_OOBINLINE is not supported, let's avoid the related mess 3657a009a70SFlorian Westphal * SO_ATTACH_FILTER, SO_ATTACH_BPF, SO_ATTACH_REUSEPORT_CBPF, 3667a009a70SFlorian Westphal * SO_DETACH_REUSEPORT_BPF, SO_DETACH_FILTER, SO_LOCK_FILTER, 3677a009a70SFlorian Westphal * we must be careful with subflows 3687a009a70SFlorian Westphal * 3697a009a70SFlorian Westphal * SO_ATTACH_REUSEPORT_EBPF is not supported, at it checks 3707a009a70SFlorian Westphal * explicitly the sk_protocol field 3717a009a70SFlorian Westphal * 3727a009a70SFlorian Westphal * SO_PEEK_OFF is unsupported, as it is for plain TCP 3737a009a70SFlorian Westphal * SO_MAX_PACING_RATE is unsupported, we must be careful with subflows 3747a009a70SFlorian Westphal * SO_CNX_ADVICE is currently unsupported, could possibly be relevant, 3757a009a70SFlorian Westphal * but likely needs careful design 3767a009a70SFlorian Westphal * 3777a009a70SFlorian Westphal * SO_ZEROCOPY is currently unsupported, TODO in sndmsg 3787a009a70SFlorian Westphal * SO_TXTIME is currently unsupported 3797a009a70SFlorian Westphal */ 3807a009a70SFlorian Westphal 3817a009a70SFlorian Westphal return -EOPNOTSUPP; 3820abdde82SPaolo Abeni } 3830abdde82SPaolo Abeni 3840abdde82SPaolo Abeni static int mptcp_setsockopt_v6(struct mptcp_sock *msk, int optname, 3850abdde82SPaolo Abeni sockptr_t optval, unsigned int optlen) 3860abdde82SPaolo Abeni { 3870abdde82SPaolo Abeni struct sock *sk = (struct sock *)msk; 3880abdde82SPaolo Abeni int ret = -EOPNOTSUPP; 3890abdde82SPaolo Abeni struct socket *ssock; 3900abdde82SPaolo Abeni 3910abdde82SPaolo Abeni switch (optname) { 3920abdde82SPaolo Abeni case IPV6_V6ONLY: 393c9406a23SFlorian Westphal case IPV6_TRANSPARENT: 394c9406a23SFlorian Westphal case IPV6_FREEBIND: 3950abdde82SPaolo Abeni lock_sock(sk); 3960abdde82SPaolo Abeni ssock = __mptcp_nmpc_socket(msk); 3970abdde82SPaolo Abeni if (!ssock) { 3980abdde82SPaolo Abeni release_sock(sk); 3990abdde82SPaolo Abeni return -EINVAL; 4000abdde82SPaolo Abeni } 4010abdde82SPaolo Abeni 4020abdde82SPaolo Abeni ret = tcp_setsockopt(ssock->sk, SOL_IPV6, optname, optval, optlen); 403c9406a23SFlorian Westphal if (ret != 0) { 404c9406a23SFlorian Westphal release_sock(sk); 405c9406a23SFlorian Westphal return ret; 406c9406a23SFlorian Westphal } 407c9406a23SFlorian Westphal 408c9406a23SFlorian Westphal sockopt_seq_inc(msk); 409c9406a23SFlorian Westphal 410c9406a23SFlorian Westphal switch (optname) { 411c9406a23SFlorian Westphal case IPV6_V6ONLY: 4120abdde82SPaolo Abeni sk->sk_ipv6only = ssock->sk->sk_ipv6only; 413c9406a23SFlorian Westphal break; 414c9406a23SFlorian Westphal case IPV6_TRANSPARENT: 415c9406a23SFlorian Westphal inet_sk(sk)->transparent = inet_sk(ssock->sk)->transparent; 416c9406a23SFlorian Westphal break; 417c9406a23SFlorian Westphal case IPV6_FREEBIND: 418c9406a23SFlorian Westphal inet_sk(sk)->freebind = inet_sk(ssock->sk)->freebind; 419c9406a23SFlorian Westphal break; 420c9406a23SFlorian Westphal } 4210abdde82SPaolo Abeni 4220abdde82SPaolo Abeni release_sock(sk); 4230abdde82SPaolo Abeni break; 4240abdde82SPaolo Abeni } 4250abdde82SPaolo Abeni 4260abdde82SPaolo Abeni return ret; 4270abdde82SPaolo Abeni } 4280abdde82SPaolo Abeni 429d9e4c129SPaolo Abeni static bool mptcp_supported_sockopt(int level, int optname) 430d9e4c129SPaolo Abeni { 431d9e4c129SPaolo Abeni if (level == SOL_IP) { 432d9e4c129SPaolo Abeni switch (optname) { 433d9e4c129SPaolo Abeni /* should work fine */ 434d9e4c129SPaolo Abeni case IP_FREEBIND: 435d9e4c129SPaolo Abeni case IP_TRANSPARENT: 436d9e4c129SPaolo Abeni 437d9e4c129SPaolo Abeni /* the following are control cmsg related */ 438d9e4c129SPaolo Abeni case IP_PKTINFO: 439d9e4c129SPaolo Abeni case IP_RECVTTL: 440d9e4c129SPaolo Abeni case IP_RECVTOS: 441d9e4c129SPaolo Abeni case IP_RECVOPTS: 442d9e4c129SPaolo Abeni case IP_RETOPTS: 443d9e4c129SPaolo Abeni case IP_PASSSEC: 444d9e4c129SPaolo Abeni case IP_RECVORIGDSTADDR: 445d9e4c129SPaolo Abeni case IP_CHECKSUM: 446d9e4c129SPaolo Abeni case IP_RECVFRAGSIZE: 447d9e4c129SPaolo Abeni 448d9e4c129SPaolo Abeni /* common stuff that need some love */ 449d9e4c129SPaolo Abeni case IP_TOS: 450d9e4c129SPaolo Abeni case IP_TTL: 451d9e4c129SPaolo Abeni case IP_BIND_ADDRESS_NO_PORT: 452d9e4c129SPaolo Abeni case IP_MTU_DISCOVER: 453d9e4c129SPaolo Abeni case IP_RECVERR: 454d9e4c129SPaolo Abeni 455d9e4c129SPaolo Abeni /* possibly less common may deserve some love */ 456d9e4c129SPaolo Abeni case IP_MINTTL: 457d9e4c129SPaolo Abeni 458d9e4c129SPaolo Abeni /* the following is apparently a no-op for plain TCP */ 459d9e4c129SPaolo Abeni case IP_RECVERR_RFC4884: 460d9e4c129SPaolo Abeni return true; 461d9e4c129SPaolo Abeni } 462d9e4c129SPaolo Abeni 463d9e4c129SPaolo Abeni /* IP_OPTIONS is not supported, needs subflow care */ 464d9e4c129SPaolo Abeni /* IP_HDRINCL, IP_NODEFRAG are not supported, RAW specific */ 465d9e4c129SPaolo Abeni /* IP_MULTICAST_TTL, IP_MULTICAST_LOOP, IP_UNICAST_IF, 466d9e4c129SPaolo Abeni * IP_ADD_MEMBERSHIP, IP_ADD_SOURCE_MEMBERSHIP, IP_DROP_MEMBERSHIP, 467d9e4c129SPaolo Abeni * IP_DROP_SOURCE_MEMBERSHIP, IP_BLOCK_SOURCE, IP_UNBLOCK_SOURCE, 468d9e4c129SPaolo Abeni * MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP MCAST_JOIN_SOURCE_GROUP, 469d9e4c129SPaolo Abeni * MCAST_LEAVE_SOURCE_GROUP, MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE, 470d9e4c129SPaolo Abeni * MCAST_MSFILTER, IP_MULTICAST_ALL are not supported, better not deal 471d9e4c129SPaolo Abeni * with mcast stuff 472d9e4c129SPaolo Abeni */ 473d9e4c129SPaolo Abeni /* IP_IPSEC_POLICY, IP_XFRM_POLICY are nut supported, unrelated here */ 474d9e4c129SPaolo Abeni return false; 475d9e4c129SPaolo Abeni } 476d9e4c129SPaolo Abeni if (level == SOL_IPV6) { 477d9e4c129SPaolo Abeni switch (optname) { 478d9e4c129SPaolo Abeni case IPV6_V6ONLY: 479d9e4c129SPaolo Abeni 480d9e4c129SPaolo Abeni /* the following are control cmsg related */ 481d9e4c129SPaolo Abeni case IPV6_RECVPKTINFO: 482d9e4c129SPaolo Abeni case IPV6_2292PKTINFO: 483d9e4c129SPaolo Abeni case IPV6_RECVHOPLIMIT: 484d9e4c129SPaolo Abeni case IPV6_2292HOPLIMIT: 485d9e4c129SPaolo Abeni case IPV6_RECVRTHDR: 486d9e4c129SPaolo Abeni case IPV6_2292RTHDR: 487d9e4c129SPaolo Abeni case IPV6_RECVHOPOPTS: 488d9e4c129SPaolo Abeni case IPV6_2292HOPOPTS: 489d9e4c129SPaolo Abeni case IPV6_RECVDSTOPTS: 490d9e4c129SPaolo Abeni case IPV6_2292DSTOPTS: 491d9e4c129SPaolo Abeni case IPV6_RECVTCLASS: 492d9e4c129SPaolo Abeni case IPV6_FLOWINFO: 493d9e4c129SPaolo Abeni case IPV6_RECVPATHMTU: 494d9e4c129SPaolo Abeni case IPV6_RECVORIGDSTADDR: 495d9e4c129SPaolo Abeni case IPV6_RECVFRAGSIZE: 496d9e4c129SPaolo Abeni 497d9e4c129SPaolo Abeni /* the following ones need some love but are quite common */ 498d9e4c129SPaolo Abeni case IPV6_TCLASS: 499d9e4c129SPaolo Abeni case IPV6_TRANSPARENT: 500d9e4c129SPaolo Abeni case IPV6_FREEBIND: 501d9e4c129SPaolo Abeni case IPV6_PKTINFO: 502d9e4c129SPaolo Abeni case IPV6_2292PKTOPTIONS: 503d9e4c129SPaolo Abeni case IPV6_UNICAST_HOPS: 504d9e4c129SPaolo Abeni case IPV6_MTU_DISCOVER: 505d9e4c129SPaolo Abeni case IPV6_MTU: 506d9e4c129SPaolo Abeni case IPV6_RECVERR: 507d9e4c129SPaolo Abeni case IPV6_FLOWINFO_SEND: 508d9e4c129SPaolo Abeni case IPV6_FLOWLABEL_MGR: 509d9e4c129SPaolo Abeni case IPV6_MINHOPCOUNT: 510d9e4c129SPaolo Abeni case IPV6_DONTFRAG: 511d9e4c129SPaolo Abeni case IPV6_AUTOFLOWLABEL: 512d9e4c129SPaolo Abeni 513d9e4c129SPaolo Abeni /* the following one is a no-op for plain TCP */ 514d9e4c129SPaolo Abeni case IPV6_RECVERR_RFC4884: 515d9e4c129SPaolo Abeni return true; 516d9e4c129SPaolo Abeni } 517d9e4c129SPaolo Abeni 518d9e4c129SPaolo Abeni /* IPV6_HOPOPTS, IPV6_RTHDRDSTOPTS, IPV6_RTHDR, IPV6_DSTOPTS are 519d9e4c129SPaolo Abeni * not supported 520d9e4c129SPaolo Abeni */ 521d9e4c129SPaolo Abeni /* IPV6_MULTICAST_HOPS, IPV6_MULTICAST_LOOP, IPV6_UNICAST_IF, 522d9e4c129SPaolo Abeni * IPV6_MULTICAST_IF, IPV6_ADDRFORM, 523d9e4c129SPaolo Abeni * IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST, 524d9e4c129SPaolo Abeni * IPV6_LEAVE_ANYCAST, IPV6_MULTICAST_ALL, MCAST_JOIN_GROUP, MCAST_LEAVE_GROUP, 525d9e4c129SPaolo Abeni * MCAST_JOIN_SOURCE_GROUP, MCAST_LEAVE_SOURCE_GROUP, 526d9e4c129SPaolo Abeni * MCAST_BLOCK_SOURCE, MCAST_UNBLOCK_SOURCE, MCAST_MSFILTER 527d9e4c129SPaolo Abeni * are not supported better not deal with mcast 528d9e4c129SPaolo Abeni */ 529d9e4c129SPaolo Abeni /* IPV6_ROUTER_ALERT, IPV6_ROUTER_ALERT_ISOLATE are not supported, since are evil */ 530d9e4c129SPaolo Abeni 531d9e4c129SPaolo Abeni /* IPV6_IPSEC_POLICY, IPV6_XFRM_POLICY are not supported */ 532d9e4c129SPaolo Abeni /* IPV6_ADDR_PREFERENCES is not supported, we must be careful with subflows */ 533d9e4c129SPaolo Abeni return false; 534d9e4c129SPaolo Abeni } 535d9e4c129SPaolo Abeni if (level == SOL_TCP) { 536d9e4c129SPaolo Abeni switch (optname) { 537d9e4c129SPaolo Abeni /* the following are no-op or should work just fine */ 538d9e4c129SPaolo Abeni case TCP_THIN_DUPACK: 539d9e4c129SPaolo Abeni case TCP_DEFER_ACCEPT: 540d9e4c129SPaolo Abeni 541d9e4c129SPaolo Abeni /* the following need some love */ 542d9e4c129SPaolo Abeni case TCP_MAXSEG: 543d9e4c129SPaolo Abeni case TCP_NODELAY: 544d9e4c129SPaolo Abeni case TCP_THIN_LINEAR_TIMEOUTS: 545d9e4c129SPaolo Abeni case TCP_CONGESTION: 546d9e4c129SPaolo Abeni case TCP_ULP: 547d9e4c129SPaolo Abeni case TCP_CORK: 548d9e4c129SPaolo Abeni case TCP_KEEPIDLE: 549d9e4c129SPaolo Abeni case TCP_KEEPINTVL: 550d9e4c129SPaolo Abeni case TCP_KEEPCNT: 551d9e4c129SPaolo Abeni case TCP_SYNCNT: 552d9e4c129SPaolo Abeni case TCP_SAVE_SYN: 553d9e4c129SPaolo Abeni case TCP_LINGER2: 554d9e4c129SPaolo Abeni case TCP_WINDOW_CLAMP: 555d9e4c129SPaolo Abeni case TCP_QUICKACK: 556d9e4c129SPaolo Abeni case TCP_USER_TIMEOUT: 557d9e4c129SPaolo Abeni case TCP_TIMESTAMP: 558d9e4c129SPaolo Abeni case TCP_NOTSENT_LOWAT: 559d9e4c129SPaolo Abeni case TCP_TX_DELAY: 560*2c9e7765SFlorian Westphal case TCP_INQ: 561d9e4c129SPaolo Abeni return true; 562d9e4c129SPaolo Abeni } 563d9e4c129SPaolo Abeni 564d9e4c129SPaolo Abeni /* TCP_MD5SIG, TCP_MD5SIG_EXT are not supported, MD5 is not compatible with MPTCP */ 565d9e4c129SPaolo Abeni 566d9e4c129SPaolo Abeni /* TCP_REPAIR, TCP_REPAIR_QUEUE, TCP_QUEUE_SEQ, TCP_REPAIR_OPTIONS, 567d9e4c129SPaolo Abeni * TCP_REPAIR_WINDOW are not supported, better avoid this mess 568d9e4c129SPaolo Abeni */ 569d9e4c129SPaolo Abeni /* TCP_FASTOPEN_KEY, TCP_FASTOPEN TCP_FASTOPEN_CONNECT, TCP_FASTOPEN_NO_COOKIE, 570d9e4c129SPaolo Abeni * are not supported fastopen is currently unsupported 571d9e4c129SPaolo Abeni */ 572d9e4c129SPaolo Abeni } 573d9e4c129SPaolo Abeni return false; 574d9e4c129SPaolo Abeni } 575d9e4c129SPaolo Abeni 576aa1fbd94SFlorian Westphal static int mptcp_setsockopt_sol_tcp_congestion(struct mptcp_sock *msk, sockptr_t optval, 577aa1fbd94SFlorian Westphal unsigned int optlen) 578aa1fbd94SFlorian Westphal { 579aa1fbd94SFlorian Westphal struct mptcp_subflow_context *subflow; 580aa1fbd94SFlorian Westphal struct sock *sk = (struct sock *)msk; 581aa1fbd94SFlorian Westphal char name[TCP_CA_NAME_MAX]; 582aa1fbd94SFlorian Westphal bool cap_net_admin; 583aa1fbd94SFlorian Westphal int ret; 584aa1fbd94SFlorian Westphal 585aa1fbd94SFlorian Westphal if (optlen < 1) 586aa1fbd94SFlorian Westphal return -EINVAL; 587aa1fbd94SFlorian Westphal 588aa1fbd94SFlorian Westphal ret = strncpy_from_sockptr(name, optval, 589aa1fbd94SFlorian Westphal min_t(long, TCP_CA_NAME_MAX - 1, optlen)); 590aa1fbd94SFlorian Westphal if (ret < 0) 591aa1fbd94SFlorian Westphal return -EFAULT; 592aa1fbd94SFlorian Westphal 593aa1fbd94SFlorian Westphal name[ret] = 0; 594aa1fbd94SFlorian Westphal 595aa1fbd94SFlorian Westphal cap_net_admin = ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN); 596aa1fbd94SFlorian Westphal 597aa1fbd94SFlorian Westphal ret = 0; 598aa1fbd94SFlorian Westphal lock_sock(sk); 599aa1fbd94SFlorian Westphal sockopt_seq_inc(msk); 600aa1fbd94SFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 601aa1fbd94SFlorian Westphal struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 602aa1fbd94SFlorian Westphal int err; 603aa1fbd94SFlorian Westphal 604aa1fbd94SFlorian Westphal lock_sock(ssk); 605aa1fbd94SFlorian Westphal err = tcp_set_congestion_control(ssk, name, true, cap_net_admin); 606aa1fbd94SFlorian Westphal if (err < 0 && ret == 0) 607aa1fbd94SFlorian Westphal ret = err; 608aa1fbd94SFlorian Westphal subflow->setsockopt_seq = msk->setsockopt_seq; 609aa1fbd94SFlorian Westphal release_sock(ssk); 610aa1fbd94SFlorian Westphal } 611aa1fbd94SFlorian Westphal 612aa1fbd94SFlorian Westphal if (ret == 0) 61320b5759fSPaolo Abeni strcpy(msk->ca_name, name); 614aa1fbd94SFlorian Westphal 615aa1fbd94SFlorian Westphal release_sock(sk); 616aa1fbd94SFlorian Westphal return ret; 617aa1fbd94SFlorian Westphal } 618aa1fbd94SFlorian Westphal 619c9406a23SFlorian Westphal static int mptcp_setsockopt_sol_ip_set_transparent(struct mptcp_sock *msk, int optname, 620c9406a23SFlorian Westphal sockptr_t optval, unsigned int optlen) 621c9406a23SFlorian Westphal { 622c9406a23SFlorian Westphal struct sock *sk = (struct sock *)msk; 623c9406a23SFlorian Westphal struct inet_sock *issk; 624c9406a23SFlorian Westphal struct socket *ssock; 625c9406a23SFlorian Westphal int err; 626c9406a23SFlorian Westphal 627c9406a23SFlorian Westphal err = ip_setsockopt(sk, SOL_IP, optname, optval, optlen); 628c9406a23SFlorian Westphal if (err != 0) 629c9406a23SFlorian Westphal return err; 630c9406a23SFlorian Westphal 631c9406a23SFlorian Westphal lock_sock(sk); 632c9406a23SFlorian Westphal 633c9406a23SFlorian Westphal ssock = __mptcp_nmpc_socket(msk); 634c9406a23SFlorian Westphal if (!ssock) { 635c9406a23SFlorian Westphal release_sock(sk); 636c9406a23SFlorian Westphal return -EINVAL; 637c9406a23SFlorian Westphal } 638c9406a23SFlorian Westphal 639c9406a23SFlorian Westphal issk = inet_sk(ssock->sk); 640c9406a23SFlorian Westphal 641c9406a23SFlorian Westphal switch (optname) { 642c9406a23SFlorian Westphal case IP_FREEBIND: 643c9406a23SFlorian Westphal issk->freebind = inet_sk(sk)->freebind; 644c9406a23SFlorian Westphal break; 645c9406a23SFlorian Westphal case IP_TRANSPARENT: 646c9406a23SFlorian Westphal issk->transparent = inet_sk(sk)->transparent; 647c9406a23SFlorian Westphal break; 648c9406a23SFlorian Westphal default: 649c9406a23SFlorian Westphal release_sock(sk); 650c9406a23SFlorian Westphal WARN_ON_ONCE(1); 651c9406a23SFlorian Westphal return -EOPNOTSUPP; 652c9406a23SFlorian Westphal } 653c9406a23SFlorian Westphal 654c9406a23SFlorian Westphal sockopt_seq_inc(msk); 655c9406a23SFlorian Westphal release_sock(sk); 656c9406a23SFlorian Westphal return 0; 657c9406a23SFlorian Westphal } 658c9406a23SFlorian Westphal 659ffcacff8SPoorva Sonparote static int mptcp_setsockopt_v4_set_tos(struct mptcp_sock *msk, int optname, 660ffcacff8SPoorva Sonparote sockptr_t optval, unsigned int optlen) 661ffcacff8SPoorva Sonparote { 662ffcacff8SPoorva Sonparote struct mptcp_subflow_context *subflow; 663ffcacff8SPoorva Sonparote struct sock *sk = (struct sock *)msk; 664ffcacff8SPoorva Sonparote int err, val; 665ffcacff8SPoorva Sonparote 666ffcacff8SPoorva Sonparote err = ip_setsockopt(sk, SOL_IP, optname, optval, optlen); 667ffcacff8SPoorva Sonparote 668ffcacff8SPoorva Sonparote if (err != 0) 669ffcacff8SPoorva Sonparote return err; 670ffcacff8SPoorva Sonparote 671ffcacff8SPoorva Sonparote lock_sock(sk); 672ffcacff8SPoorva Sonparote sockopt_seq_inc(msk); 673ffcacff8SPoorva Sonparote val = inet_sk(sk)->tos; 674ffcacff8SPoorva Sonparote mptcp_for_each_subflow(msk, subflow) { 675ffcacff8SPoorva Sonparote struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 676ffcacff8SPoorva Sonparote 677ffcacff8SPoorva Sonparote __ip_sock_set_tos(ssk, val); 678ffcacff8SPoorva Sonparote } 679ffcacff8SPoorva Sonparote release_sock(sk); 680ffcacff8SPoorva Sonparote 681ffcacff8SPoorva Sonparote return err; 682ffcacff8SPoorva Sonparote } 683ffcacff8SPoorva Sonparote 684ffcacff8SPoorva Sonparote static int mptcp_setsockopt_v4(struct mptcp_sock *msk, int optname, 685ffcacff8SPoorva Sonparote sockptr_t optval, unsigned int optlen) 686ffcacff8SPoorva Sonparote { 687ffcacff8SPoorva Sonparote switch (optname) { 688c9406a23SFlorian Westphal case IP_FREEBIND: 689c9406a23SFlorian Westphal case IP_TRANSPARENT: 690c9406a23SFlorian Westphal return mptcp_setsockopt_sol_ip_set_transparent(msk, optname, optval, optlen); 691ffcacff8SPoorva Sonparote case IP_TOS: 692ffcacff8SPoorva Sonparote return mptcp_setsockopt_v4_set_tos(msk, optname, optval, optlen); 693ffcacff8SPoorva Sonparote } 694ffcacff8SPoorva Sonparote 695ffcacff8SPoorva Sonparote return -EOPNOTSUPP; 696ffcacff8SPoorva Sonparote } 697ffcacff8SPoorva Sonparote 698aa1fbd94SFlorian Westphal static int mptcp_setsockopt_sol_tcp(struct mptcp_sock *msk, int optname, 699aa1fbd94SFlorian Westphal sockptr_t optval, unsigned int optlen) 700aa1fbd94SFlorian Westphal { 701*2c9e7765SFlorian Westphal struct sock *sk = (void *)msk; 702*2c9e7765SFlorian Westphal int ret, val; 703*2c9e7765SFlorian Westphal 704aa1fbd94SFlorian Westphal switch (optname) { 705*2c9e7765SFlorian Westphal case TCP_INQ: 706*2c9e7765SFlorian Westphal ret = mptcp_get_int_option(msk, optval, optlen, &val); 707*2c9e7765SFlorian Westphal if (ret) 708*2c9e7765SFlorian Westphal return ret; 709*2c9e7765SFlorian Westphal if (val < 0 || val > 1) 710*2c9e7765SFlorian Westphal return -EINVAL; 711*2c9e7765SFlorian Westphal 712*2c9e7765SFlorian Westphal lock_sock(sk); 713*2c9e7765SFlorian Westphal msk->recvmsg_inq = !!val; 714*2c9e7765SFlorian Westphal release_sock(sk); 715*2c9e7765SFlorian Westphal return 0; 716aa1fbd94SFlorian Westphal case TCP_ULP: 717aa1fbd94SFlorian Westphal return -EOPNOTSUPP; 718aa1fbd94SFlorian Westphal case TCP_CONGESTION: 719aa1fbd94SFlorian Westphal return mptcp_setsockopt_sol_tcp_congestion(msk, optval, optlen); 720aa1fbd94SFlorian Westphal } 721aa1fbd94SFlorian Westphal 722aa1fbd94SFlorian Westphal return -EOPNOTSUPP; 723aa1fbd94SFlorian Westphal } 724aa1fbd94SFlorian Westphal 7250abdde82SPaolo Abeni int mptcp_setsockopt(struct sock *sk, int level, int optname, 7260abdde82SPaolo Abeni sockptr_t optval, unsigned int optlen) 7270abdde82SPaolo Abeni { 7280abdde82SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 7290abdde82SPaolo Abeni struct sock *ssk; 7300abdde82SPaolo Abeni 7310abdde82SPaolo Abeni pr_debug("msk=%p", msk); 7320abdde82SPaolo Abeni 7330abdde82SPaolo Abeni if (level == SOL_SOCKET) 7340abdde82SPaolo Abeni return mptcp_setsockopt_sol_socket(msk, optname, optval, optlen); 7350abdde82SPaolo Abeni 7367a009a70SFlorian Westphal if (!mptcp_supported_sockopt(level, optname)) 7377a009a70SFlorian Westphal return -ENOPROTOOPT; 7387a009a70SFlorian Westphal 7390abdde82SPaolo Abeni /* @@ the meaning of setsockopt() when the socket is connected and 7400abdde82SPaolo Abeni * there are multiple subflows is not yet defined. It is up to the 7410abdde82SPaolo Abeni * MPTCP-level socket to configure the subflows until the subflow 7420abdde82SPaolo Abeni * is in TCP fallback, when TCP socket options are passed through 7430abdde82SPaolo Abeni * to the one remaining subflow. 7440abdde82SPaolo Abeni */ 7450abdde82SPaolo Abeni lock_sock(sk); 7460abdde82SPaolo Abeni ssk = __mptcp_tcp_fallback(msk); 7470abdde82SPaolo Abeni release_sock(sk); 7480abdde82SPaolo Abeni if (ssk) 7490abdde82SPaolo Abeni return tcp_setsockopt(ssk, level, optname, optval, optlen); 7500abdde82SPaolo Abeni 751ffcacff8SPoorva Sonparote if (level == SOL_IP) 752ffcacff8SPoorva Sonparote return mptcp_setsockopt_v4(msk, optname, optval, optlen); 753ffcacff8SPoorva Sonparote 7540abdde82SPaolo Abeni if (level == SOL_IPV6) 7550abdde82SPaolo Abeni return mptcp_setsockopt_v6(msk, optname, optval, optlen); 7560abdde82SPaolo Abeni 757aa1fbd94SFlorian Westphal if (level == SOL_TCP) 758aa1fbd94SFlorian Westphal return mptcp_setsockopt_sol_tcp(msk, optname, optval, optlen); 759aa1fbd94SFlorian Westphal 760aa1fbd94SFlorian Westphal return -EOPNOTSUPP; 761aa1fbd94SFlorian Westphal } 762aa1fbd94SFlorian Westphal 763aa1fbd94SFlorian Westphal static int mptcp_getsockopt_first_sf_only(struct mptcp_sock *msk, int level, int optname, 764aa1fbd94SFlorian Westphal char __user *optval, int __user *optlen) 765aa1fbd94SFlorian Westphal { 766aa1fbd94SFlorian Westphal struct sock *sk = (struct sock *)msk; 767aa1fbd94SFlorian Westphal struct socket *ssock; 768aa1fbd94SFlorian Westphal int ret = -EINVAL; 769aa1fbd94SFlorian Westphal struct sock *ssk; 770aa1fbd94SFlorian Westphal 771aa1fbd94SFlorian Westphal lock_sock(sk); 772aa1fbd94SFlorian Westphal ssk = msk->first; 773aa1fbd94SFlorian Westphal if (ssk) { 774aa1fbd94SFlorian Westphal ret = tcp_getsockopt(ssk, level, optname, optval, optlen); 775aa1fbd94SFlorian Westphal goto out; 776aa1fbd94SFlorian Westphal } 777aa1fbd94SFlorian Westphal 778aa1fbd94SFlorian Westphal ssock = __mptcp_nmpc_socket(msk); 779aa1fbd94SFlorian Westphal if (!ssock) 780aa1fbd94SFlorian Westphal goto out; 781aa1fbd94SFlorian Westphal 782aa1fbd94SFlorian Westphal ret = tcp_getsockopt(ssock->sk, level, optname, optval, optlen); 783aa1fbd94SFlorian Westphal 784aa1fbd94SFlorian Westphal out: 785aa1fbd94SFlorian Westphal release_sock(sk); 786aa1fbd94SFlorian Westphal return ret; 787aa1fbd94SFlorian Westphal } 788aa1fbd94SFlorian Westphal 78961bc6e82SFlorian Westphal void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info) 79061bc6e82SFlorian Westphal { 79161bc6e82SFlorian Westphal struct sock *sk = &msk->sk.icsk_inet.sk; 79261bc6e82SFlorian Westphal u32 flags = 0; 79355c42fa7SFlorian Westphal bool slow; 79461bc6e82SFlorian Westphal u8 val; 79561bc6e82SFlorian Westphal 79655c42fa7SFlorian Westphal memset(info, 0, sizeof(*info)); 79755c42fa7SFlorian Westphal 79855c42fa7SFlorian Westphal slow = lock_sock_fast(sk); 79955c42fa7SFlorian Westphal 80061bc6e82SFlorian Westphal info->mptcpi_subflows = READ_ONCE(msk->pm.subflows); 80161bc6e82SFlorian Westphal info->mptcpi_add_addr_signal = READ_ONCE(msk->pm.add_addr_signaled); 80261bc6e82SFlorian Westphal info->mptcpi_add_addr_accepted = READ_ONCE(msk->pm.add_addr_accepted); 80361bc6e82SFlorian Westphal info->mptcpi_local_addr_used = READ_ONCE(msk->pm.local_addr_used); 80461bc6e82SFlorian Westphal info->mptcpi_subflows_max = mptcp_pm_get_subflows_max(msk); 80561bc6e82SFlorian Westphal val = mptcp_pm_get_add_addr_signal_max(msk); 80661bc6e82SFlorian Westphal info->mptcpi_add_addr_signal_max = val; 80761bc6e82SFlorian Westphal val = mptcp_pm_get_add_addr_accept_max(msk); 80861bc6e82SFlorian Westphal info->mptcpi_add_addr_accepted_max = val; 80961bc6e82SFlorian Westphal info->mptcpi_local_addr_max = mptcp_pm_get_local_addr_max(msk); 81061bc6e82SFlorian Westphal if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) 81161bc6e82SFlorian Westphal flags |= MPTCP_INFO_FLAG_FALLBACK; 81261bc6e82SFlorian Westphal if (READ_ONCE(msk->can_ack)) 81361bc6e82SFlorian Westphal flags |= MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED; 81461bc6e82SFlorian Westphal info->mptcpi_flags = flags; 81561bc6e82SFlorian Westphal info->mptcpi_token = READ_ONCE(msk->token); 81661bc6e82SFlorian Westphal info->mptcpi_write_seq = READ_ONCE(msk->write_seq); 81761bc6e82SFlorian Westphal info->mptcpi_snd_una = READ_ONCE(msk->snd_una); 81861bc6e82SFlorian Westphal info->mptcpi_rcv_nxt = READ_ONCE(msk->ack_seq); 81961bc6e82SFlorian Westphal info->mptcpi_csum_enabled = READ_ONCE(msk->csum_enabled); 82061bc6e82SFlorian Westphal 82161bc6e82SFlorian Westphal unlock_sock_fast(sk, slow); 82261bc6e82SFlorian Westphal } 82361bc6e82SFlorian Westphal EXPORT_SYMBOL_GPL(mptcp_diag_fill_info); 82461bc6e82SFlorian Westphal 82555c42fa7SFlorian Westphal static int mptcp_getsockopt_info(struct mptcp_sock *msk, char __user *optval, int __user *optlen) 82655c42fa7SFlorian Westphal { 82755c42fa7SFlorian Westphal struct mptcp_info m_info; 82855c42fa7SFlorian Westphal int len; 82955c42fa7SFlorian Westphal 83055c42fa7SFlorian Westphal if (get_user(len, optlen)) 83155c42fa7SFlorian Westphal return -EFAULT; 83255c42fa7SFlorian Westphal 83355c42fa7SFlorian Westphal len = min_t(unsigned int, len, sizeof(struct mptcp_info)); 83455c42fa7SFlorian Westphal 83555c42fa7SFlorian Westphal mptcp_diag_fill_info(msk, &m_info); 83655c42fa7SFlorian Westphal 83755c42fa7SFlorian Westphal if (put_user(len, optlen)) 83855c42fa7SFlorian Westphal return -EFAULT; 83955c42fa7SFlorian Westphal 84055c42fa7SFlorian Westphal if (copy_to_user(optval, &m_info, len)) 84155c42fa7SFlorian Westphal return -EFAULT; 84255c42fa7SFlorian Westphal 84355c42fa7SFlorian Westphal return 0; 84455c42fa7SFlorian Westphal } 84555c42fa7SFlorian Westphal 84606f15ceeSFlorian Westphal static int mptcp_put_subflow_data(struct mptcp_subflow_data *sfd, 84706f15ceeSFlorian Westphal char __user *optval, 84806f15ceeSFlorian Westphal u32 copied, 84906f15ceeSFlorian Westphal int __user *optlen) 85006f15ceeSFlorian Westphal { 85106f15ceeSFlorian Westphal u32 copylen = min_t(u32, sfd->size_subflow_data, sizeof(*sfd)); 85206f15ceeSFlorian Westphal 85306f15ceeSFlorian Westphal if (copied) 85406f15ceeSFlorian Westphal copied += sfd->size_subflow_data; 85506f15ceeSFlorian Westphal else 85606f15ceeSFlorian Westphal copied = copylen; 85706f15ceeSFlorian Westphal 85806f15ceeSFlorian Westphal if (put_user(copied, optlen)) 85906f15ceeSFlorian Westphal return -EFAULT; 86006f15ceeSFlorian Westphal 86106f15ceeSFlorian Westphal if (copy_to_user(optval, sfd, copylen)) 86206f15ceeSFlorian Westphal return -EFAULT; 86306f15ceeSFlorian Westphal 86406f15ceeSFlorian Westphal return 0; 86506f15ceeSFlorian Westphal } 86606f15ceeSFlorian Westphal 86706f15ceeSFlorian Westphal static int mptcp_get_subflow_data(struct mptcp_subflow_data *sfd, 86806f15ceeSFlorian Westphal char __user *optval, int __user *optlen) 86906f15ceeSFlorian Westphal { 87006f15ceeSFlorian Westphal int len, copylen; 87106f15ceeSFlorian Westphal 87206f15ceeSFlorian Westphal if (get_user(len, optlen)) 87306f15ceeSFlorian Westphal return -EFAULT; 87406f15ceeSFlorian Westphal 87506f15ceeSFlorian Westphal /* if mptcp_subflow_data size is changed, need to adjust 87606f15ceeSFlorian Westphal * this function to deal with programs using old version. 87706f15ceeSFlorian Westphal */ 87806f15ceeSFlorian Westphal BUILD_BUG_ON(sizeof(*sfd) != MIN_INFO_OPTLEN_SIZE); 87906f15ceeSFlorian Westphal 88006f15ceeSFlorian Westphal if (len < MIN_INFO_OPTLEN_SIZE) 88106f15ceeSFlorian Westphal return -EINVAL; 88206f15ceeSFlorian Westphal 88306f15ceeSFlorian Westphal memset(sfd, 0, sizeof(*sfd)); 88406f15ceeSFlorian Westphal 88506f15ceeSFlorian Westphal copylen = min_t(unsigned int, len, sizeof(*sfd)); 88606f15ceeSFlorian Westphal if (copy_from_user(sfd, optval, copylen)) 88706f15ceeSFlorian Westphal return -EFAULT; 88806f15ceeSFlorian Westphal 88906f15ceeSFlorian Westphal /* size_subflow_data is u32, but len is signed */ 89006f15ceeSFlorian Westphal if (sfd->size_subflow_data > INT_MAX || 89106f15ceeSFlorian Westphal sfd->size_user > INT_MAX) 89206f15ceeSFlorian Westphal return -EINVAL; 89306f15ceeSFlorian Westphal 89406f15ceeSFlorian Westphal if (sfd->size_subflow_data < MIN_INFO_OPTLEN_SIZE || 89506f15ceeSFlorian Westphal sfd->size_subflow_data > len) 89606f15ceeSFlorian Westphal return -EINVAL; 89706f15ceeSFlorian Westphal 89806f15ceeSFlorian Westphal if (sfd->num_subflows || sfd->size_kernel) 89906f15ceeSFlorian Westphal return -EINVAL; 90006f15ceeSFlorian Westphal 90106f15ceeSFlorian Westphal return len - sfd->size_subflow_data; 90206f15ceeSFlorian Westphal } 90306f15ceeSFlorian Westphal 90406f15ceeSFlorian Westphal static int mptcp_getsockopt_tcpinfo(struct mptcp_sock *msk, char __user *optval, 90506f15ceeSFlorian Westphal int __user *optlen) 90606f15ceeSFlorian Westphal { 90706f15ceeSFlorian Westphal struct mptcp_subflow_context *subflow; 90806f15ceeSFlorian Westphal struct sock *sk = &msk->sk.icsk_inet.sk; 90906f15ceeSFlorian Westphal unsigned int sfcount = 0, copied = 0; 91006f15ceeSFlorian Westphal struct mptcp_subflow_data sfd; 91106f15ceeSFlorian Westphal char __user *infoptr; 91206f15ceeSFlorian Westphal int len; 91306f15ceeSFlorian Westphal 91406f15ceeSFlorian Westphal len = mptcp_get_subflow_data(&sfd, optval, optlen); 91506f15ceeSFlorian Westphal if (len < 0) 91606f15ceeSFlorian Westphal return len; 91706f15ceeSFlorian Westphal 91806f15ceeSFlorian Westphal sfd.size_kernel = sizeof(struct tcp_info); 91906f15ceeSFlorian Westphal sfd.size_user = min_t(unsigned int, sfd.size_user, 92006f15ceeSFlorian Westphal sizeof(struct tcp_info)); 92106f15ceeSFlorian Westphal 92206f15ceeSFlorian Westphal infoptr = optval + sfd.size_subflow_data; 92306f15ceeSFlorian Westphal 92406f15ceeSFlorian Westphal lock_sock(sk); 92506f15ceeSFlorian Westphal 92606f15ceeSFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 92706f15ceeSFlorian Westphal struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 92806f15ceeSFlorian Westphal 92906f15ceeSFlorian Westphal ++sfcount; 93006f15ceeSFlorian Westphal 93106f15ceeSFlorian Westphal if (len && len >= sfd.size_user) { 93206f15ceeSFlorian Westphal struct tcp_info info; 93306f15ceeSFlorian Westphal 93406f15ceeSFlorian Westphal tcp_get_info(ssk, &info); 93506f15ceeSFlorian Westphal 93606f15ceeSFlorian Westphal if (copy_to_user(infoptr, &info, sfd.size_user)) { 93706f15ceeSFlorian Westphal release_sock(sk); 93806f15ceeSFlorian Westphal return -EFAULT; 93906f15ceeSFlorian Westphal } 94006f15ceeSFlorian Westphal 94106f15ceeSFlorian Westphal infoptr += sfd.size_user; 94206f15ceeSFlorian Westphal copied += sfd.size_user; 94306f15ceeSFlorian Westphal len -= sfd.size_user; 94406f15ceeSFlorian Westphal } 94506f15ceeSFlorian Westphal } 94606f15ceeSFlorian Westphal 94706f15ceeSFlorian Westphal release_sock(sk); 94806f15ceeSFlorian Westphal 94906f15ceeSFlorian Westphal sfd.num_subflows = sfcount; 95006f15ceeSFlorian Westphal 95106f15ceeSFlorian Westphal if (mptcp_put_subflow_data(&sfd, optval, copied, optlen)) 95206f15ceeSFlorian Westphal return -EFAULT; 95306f15ceeSFlorian Westphal 95406f15ceeSFlorian Westphal return 0; 95506f15ceeSFlorian Westphal } 95606f15ceeSFlorian Westphal 957c11c5906SFlorian Westphal static void mptcp_get_sub_addrs(const struct sock *sk, struct mptcp_subflow_addrs *a) 958c11c5906SFlorian Westphal { 959c11c5906SFlorian Westphal struct inet_sock *inet = inet_sk(sk); 960c11c5906SFlorian Westphal 961c11c5906SFlorian Westphal memset(a, 0, sizeof(*a)); 962c11c5906SFlorian Westphal 963c11c5906SFlorian Westphal if (sk->sk_family == AF_INET) { 964c11c5906SFlorian Westphal a->sin_local.sin_family = AF_INET; 965c11c5906SFlorian Westphal a->sin_local.sin_port = inet->inet_sport; 966c11c5906SFlorian Westphal a->sin_local.sin_addr.s_addr = inet->inet_rcv_saddr; 967c11c5906SFlorian Westphal 968c11c5906SFlorian Westphal if (!a->sin_local.sin_addr.s_addr) 969c11c5906SFlorian Westphal a->sin_local.sin_addr.s_addr = inet->inet_saddr; 970c11c5906SFlorian Westphal 971c11c5906SFlorian Westphal a->sin_remote.sin_family = AF_INET; 972c11c5906SFlorian Westphal a->sin_remote.sin_port = inet->inet_dport; 973c11c5906SFlorian Westphal a->sin_remote.sin_addr.s_addr = inet->inet_daddr; 974c11c5906SFlorian Westphal #if IS_ENABLED(CONFIG_IPV6) 975c11c5906SFlorian Westphal } else if (sk->sk_family == AF_INET6) { 976c11c5906SFlorian Westphal const struct ipv6_pinfo *np = inet6_sk(sk); 977c11c5906SFlorian Westphal 97829211e7dSTim Gardner if (WARN_ON_ONCE(!np)) 97929211e7dSTim Gardner return; 98029211e7dSTim Gardner 981c11c5906SFlorian Westphal a->sin6_local.sin6_family = AF_INET6; 982c11c5906SFlorian Westphal a->sin6_local.sin6_port = inet->inet_sport; 983c11c5906SFlorian Westphal 984c11c5906SFlorian Westphal if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) 985c11c5906SFlorian Westphal a->sin6_local.sin6_addr = np->saddr; 986c11c5906SFlorian Westphal else 987c11c5906SFlorian Westphal a->sin6_local.sin6_addr = sk->sk_v6_rcv_saddr; 988c11c5906SFlorian Westphal 989c11c5906SFlorian Westphal a->sin6_remote.sin6_family = AF_INET6; 990c11c5906SFlorian Westphal a->sin6_remote.sin6_port = inet->inet_dport; 991c11c5906SFlorian Westphal a->sin6_remote.sin6_addr = sk->sk_v6_daddr; 992c11c5906SFlorian Westphal #endif 993c11c5906SFlorian Westphal } 994c11c5906SFlorian Westphal } 995c11c5906SFlorian Westphal 996c11c5906SFlorian Westphal static int mptcp_getsockopt_subflow_addrs(struct mptcp_sock *msk, char __user *optval, 997c11c5906SFlorian Westphal int __user *optlen) 998c11c5906SFlorian Westphal { 999c11c5906SFlorian Westphal struct sock *sk = &msk->sk.icsk_inet.sk; 1000c11c5906SFlorian Westphal struct mptcp_subflow_context *subflow; 1001c11c5906SFlorian Westphal unsigned int sfcount = 0, copied = 0; 1002c11c5906SFlorian Westphal struct mptcp_subflow_data sfd; 1003c11c5906SFlorian Westphal char __user *addrptr; 1004c11c5906SFlorian Westphal int len; 1005c11c5906SFlorian Westphal 1006c11c5906SFlorian Westphal len = mptcp_get_subflow_data(&sfd, optval, optlen); 1007c11c5906SFlorian Westphal if (len < 0) 1008c11c5906SFlorian Westphal return len; 1009c11c5906SFlorian Westphal 1010c11c5906SFlorian Westphal sfd.size_kernel = sizeof(struct mptcp_subflow_addrs); 1011c11c5906SFlorian Westphal sfd.size_user = min_t(unsigned int, sfd.size_user, 1012c11c5906SFlorian Westphal sizeof(struct mptcp_subflow_addrs)); 1013c11c5906SFlorian Westphal 1014c11c5906SFlorian Westphal addrptr = optval + sfd.size_subflow_data; 1015c11c5906SFlorian Westphal 1016c11c5906SFlorian Westphal lock_sock(sk); 1017c11c5906SFlorian Westphal 1018c11c5906SFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 1019c11c5906SFlorian Westphal struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1020c11c5906SFlorian Westphal 1021c11c5906SFlorian Westphal ++sfcount; 1022c11c5906SFlorian Westphal 1023c11c5906SFlorian Westphal if (len && len >= sfd.size_user) { 1024c11c5906SFlorian Westphal struct mptcp_subflow_addrs a; 1025c11c5906SFlorian Westphal 1026c11c5906SFlorian Westphal mptcp_get_sub_addrs(ssk, &a); 1027c11c5906SFlorian Westphal 1028c11c5906SFlorian Westphal if (copy_to_user(addrptr, &a, sfd.size_user)) { 1029c11c5906SFlorian Westphal release_sock(sk); 1030c11c5906SFlorian Westphal return -EFAULT; 1031c11c5906SFlorian Westphal } 1032c11c5906SFlorian Westphal 1033c11c5906SFlorian Westphal addrptr += sfd.size_user; 1034c11c5906SFlorian Westphal copied += sfd.size_user; 1035c11c5906SFlorian Westphal len -= sfd.size_user; 1036c11c5906SFlorian Westphal } 1037c11c5906SFlorian Westphal } 1038c11c5906SFlorian Westphal 1039c11c5906SFlorian Westphal release_sock(sk); 1040c11c5906SFlorian Westphal 1041c11c5906SFlorian Westphal sfd.num_subflows = sfcount; 1042c11c5906SFlorian Westphal 1043c11c5906SFlorian Westphal if (mptcp_put_subflow_data(&sfd, optval, copied, optlen)) 1044c11c5906SFlorian Westphal return -EFAULT; 1045c11c5906SFlorian Westphal 1046c11c5906SFlorian Westphal return 0; 1047c11c5906SFlorian Westphal } 1048c11c5906SFlorian Westphal 1049*2c9e7765SFlorian Westphal static int mptcp_put_int_option(struct mptcp_sock *msk, char __user *optval, 1050*2c9e7765SFlorian Westphal int __user *optlen, int val) 1051*2c9e7765SFlorian Westphal { 1052*2c9e7765SFlorian Westphal int len; 1053*2c9e7765SFlorian Westphal 1054*2c9e7765SFlorian Westphal if (get_user(len, optlen)) 1055*2c9e7765SFlorian Westphal return -EFAULT; 1056*2c9e7765SFlorian Westphal 1057*2c9e7765SFlorian Westphal len = min_t(unsigned int, len, sizeof(int)); 1058*2c9e7765SFlorian Westphal if (len < 0) 1059*2c9e7765SFlorian Westphal return -EINVAL; 1060*2c9e7765SFlorian Westphal 1061*2c9e7765SFlorian Westphal if (put_user(len, optlen)) 1062*2c9e7765SFlorian Westphal return -EFAULT; 1063*2c9e7765SFlorian Westphal if (copy_to_user(optval, &val, len)) 1064*2c9e7765SFlorian Westphal return -EFAULT; 1065*2c9e7765SFlorian Westphal 1066*2c9e7765SFlorian Westphal return 0; 1067*2c9e7765SFlorian Westphal } 1068*2c9e7765SFlorian Westphal 1069aa1fbd94SFlorian Westphal static int mptcp_getsockopt_sol_tcp(struct mptcp_sock *msk, int optname, 1070aa1fbd94SFlorian Westphal char __user *optval, int __user *optlen) 1071aa1fbd94SFlorian Westphal { 1072aa1fbd94SFlorian Westphal switch (optname) { 1073aa1fbd94SFlorian Westphal case TCP_ULP: 1074aa1fbd94SFlorian Westphal case TCP_CONGESTION: 1075aa1fbd94SFlorian Westphal case TCP_INFO: 1076aa1fbd94SFlorian Westphal case TCP_CC_INFO: 1077aa1fbd94SFlorian Westphal return mptcp_getsockopt_first_sf_only(msk, SOL_TCP, optname, 1078aa1fbd94SFlorian Westphal optval, optlen); 1079*2c9e7765SFlorian Westphal case TCP_INQ: 1080*2c9e7765SFlorian Westphal return mptcp_put_int_option(msk, optval, optlen, msk->recvmsg_inq); 1081aa1fbd94SFlorian Westphal } 10820abdde82SPaolo Abeni return -EOPNOTSUPP; 10830abdde82SPaolo Abeni } 10840abdde82SPaolo Abeni 108555c42fa7SFlorian Westphal static int mptcp_getsockopt_sol_mptcp(struct mptcp_sock *msk, int optname, 108655c42fa7SFlorian Westphal char __user *optval, int __user *optlen) 108755c42fa7SFlorian Westphal { 108855c42fa7SFlorian Westphal switch (optname) { 108955c42fa7SFlorian Westphal case MPTCP_INFO: 109055c42fa7SFlorian Westphal return mptcp_getsockopt_info(msk, optval, optlen); 109106f15ceeSFlorian Westphal case MPTCP_TCPINFO: 109206f15ceeSFlorian Westphal return mptcp_getsockopt_tcpinfo(msk, optval, optlen); 1093c11c5906SFlorian Westphal case MPTCP_SUBFLOW_ADDRS: 1094c11c5906SFlorian Westphal return mptcp_getsockopt_subflow_addrs(msk, optval, optlen); 109555c42fa7SFlorian Westphal } 109655c42fa7SFlorian Westphal 109755c42fa7SFlorian Westphal return -EOPNOTSUPP; 109855c42fa7SFlorian Westphal } 109955c42fa7SFlorian Westphal 11000abdde82SPaolo Abeni int mptcp_getsockopt(struct sock *sk, int level, int optname, 11010abdde82SPaolo Abeni char __user *optval, int __user *option) 11020abdde82SPaolo Abeni { 11030abdde82SPaolo Abeni struct mptcp_sock *msk = mptcp_sk(sk); 11040abdde82SPaolo Abeni struct sock *ssk; 11050abdde82SPaolo Abeni 11060abdde82SPaolo Abeni pr_debug("msk=%p", msk); 11070abdde82SPaolo Abeni 11080abdde82SPaolo Abeni /* @@ the meaning of setsockopt() when the socket is connected and 11090abdde82SPaolo Abeni * there are multiple subflows is not yet defined. It is up to the 11100abdde82SPaolo Abeni * MPTCP-level socket to configure the subflows until the subflow 11110abdde82SPaolo Abeni * is in TCP fallback, when socket options are passed through 11120abdde82SPaolo Abeni * to the one remaining subflow. 11130abdde82SPaolo Abeni */ 11140abdde82SPaolo Abeni lock_sock(sk); 11150abdde82SPaolo Abeni ssk = __mptcp_tcp_fallback(msk); 11160abdde82SPaolo Abeni release_sock(sk); 11170abdde82SPaolo Abeni if (ssk) 11180abdde82SPaolo Abeni return tcp_getsockopt(ssk, level, optname, optval, option); 11190abdde82SPaolo Abeni 1120aa1fbd94SFlorian Westphal if (level == SOL_TCP) 1121aa1fbd94SFlorian Westphal return mptcp_getsockopt_sol_tcp(msk, optname, optval, option); 112255c42fa7SFlorian Westphal if (level == SOL_MPTCP) 112355c42fa7SFlorian Westphal return mptcp_getsockopt_sol_mptcp(msk, optname, optval, option); 11240abdde82SPaolo Abeni return -EOPNOTSUPP; 11250abdde82SPaolo Abeni } 11260abdde82SPaolo Abeni 11271b3e7edeSFlorian Westphal static void sync_socket_options(struct mptcp_sock *msk, struct sock *ssk) 11281b3e7edeSFlorian Westphal { 11295d0a6bc8SFlorian Westphal static const unsigned int tx_rx_locks = SOCK_RCVBUF_LOCK | SOCK_SNDBUF_LOCK; 11301b3e7edeSFlorian Westphal struct sock *sk = (struct sock *)msk; 11311b3e7edeSFlorian Westphal 11321b3e7edeSFlorian Westphal if (ssk->sk_prot->keepalive) { 11331b3e7edeSFlorian Westphal if (sock_flag(sk, SOCK_KEEPOPEN)) 11341b3e7edeSFlorian Westphal ssk->sk_prot->keepalive(ssk, 1); 11351b3e7edeSFlorian Westphal else 11361b3e7edeSFlorian Westphal ssk->sk_prot->keepalive(ssk, 0); 11371b3e7edeSFlorian Westphal } 11381b3e7edeSFlorian Westphal 11391b3e7edeSFlorian Westphal ssk->sk_priority = sk->sk_priority; 11405d0a6bc8SFlorian Westphal ssk->sk_bound_dev_if = sk->sk_bound_dev_if; 11415d0a6bc8SFlorian Westphal ssk->sk_incoming_cpu = sk->sk_incoming_cpu; 1142ffcacff8SPoorva Sonparote __ip_sock_set_tos(ssk, inet_sk(sk)->tos); 11435d0a6bc8SFlorian Westphal 11445d0a6bc8SFlorian Westphal if (sk->sk_userlocks & tx_rx_locks) { 11455d0a6bc8SFlorian Westphal ssk->sk_userlocks |= sk->sk_userlocks & tx_rx_locks; 11465d0a6bc8SFlorian Westphal if (sk->sk_userlocks & SOCK_SNDBUF_LOCK) 11475d0a6bc8SFlorian Westphal WRITE_ONCE(ssk->sk_sndbuf, sk->sk_sndbuf); 11485d0a6bc8SFlorian Westphal if (sk->sk_userlocks & SOCK_RCVBUF_LOCK) 11495d0a6bc8SFlorian Westphal WRITE_ONCE(ssk->sk_rcvbuf, sk->sk_rcvbuf); 11505d0a6bc8SFlorian Westphal } 11515d0a6bc8SFlorian Westphal 11525d0a6bc8SFlorian Westphal if (sock_flag(sk, SOCK_LINGER)) { 11535d0a6bc8SFlorian Westphal ssk->sk_lingertime = sk->sk_lingertime; 11545d0a6bc8SFlorian Westphal sock_set_flag(ssk, SOCK_LINGER); 11555d0a6bc8SFlorian Westphal } else { 11565d0a6bc8SFlorian Westphal sock_reset_flag(ssk, SOCK_LINGER); 11575d0a6bc8SFlorian Westphal } 11585d0a6bc8SFlorian Westphal 11595d0a6bc8SFlorian Westphal if (sk->sk_mark != ssk->sk_mark) { 11605d0a6bc8SFlorian Westphal ssk->sk_mark = sk->sk_mark; 11615d0a6bc8SFlorian Westphal sk_dst_reset(ssk); 11625d0a6bc8SFlorian Westphal } 11635d0a6bc8SFlorian Westphal 11645d0a6bc8SFlorian Westphal sock_valbool_flag(ssk, SOCK_DBG, sock_flag(sk, SOCK_DBG)); 11655d0a6bc8SFlorian Westphal 11665d0a6bc8SFlorian Westphal if (inet_csk(sk)->icsk_ca_ops != inet_csk(ssk)->icsk_ca_ops) 116720b5759fSPaolo Abeni tcp_set_congestion_control(ssk, msk->ca_name, false, true); 1168c9406a23SFlorian Westphal 1169c9406a23SFlorian Westphal inet_sk(ssk)->transparent = inet_sk(sk)->transparent; 1170c9406a23SFlorian Westphal inet_sk(ssk)->freebind = inet_sk(sk)->freebind; 11711b3e7edeSFlorian Westphal } 11721b3e7edeSFlorian Westphal 1173df00b087SFlorian Westphal static void __mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk) 1174df00b087SFlorian Westphal { 11751b3e7edeSFlorian Westphal bool slow = lock_sock_fast(ssk); 11761b3e7edeSFlorian Westphal 11771b3e7edeSFlorian Westphal sync_socket_options(msk, ssk); 11781b3e7edeSFlorian Westphal 11791b3e7edeSFlorian Westphal unlock_sock_fast(ssk, slow); 1180df00b087SFlorian Westphal } 1181df00b087SFlorian Westphal 118278962489SFlorian Westphal void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk) 118378962489SFlorian Westphal { 1184df00b087SFlorian Westphal struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk); 1185df00b087SFlorian Westphal 118678962489SFlorian Westphal msk_owned_by_me(msk); 1187df00b087SFlorian Westphal 1188df00b087SFlorian Westphal if (READ_ONCE(subflow->setsockopt_seq) != msk->setsockopt_seq) { 1189df00b087SFlorian Westphal __mptcp_sockopt_sync(msk, ssk); 1190df00b087SFlorian Westphal 1191df00b087SFlorian Westphal subflow->setsockopt_seq = msk->setsockopt_seq; 1192df00b087SFlorian Westphal } 119378962489SFlorian Westphal } 119478962489SFlorian Westphal 119578962489SFlorian Westphal void mptcp_sockopt_sync_all(struct mptcp_sock *msk) 119678962489SFlorian Westphal { 119778962489SFlorian Westphal struct mptcp_subflow_context *subflow; 1198df00b087SFlorian Westphal struct sock *sk = (struct sock *)msk; 1199df00b087SFlorian Westphal u32 seq; 120078962489SFlorian Westphal 1201df00b087SFlorian Westphal seq = sockopt_seq_reset(sk); 120278962489SFlorian Westphal 120378962489SFlorian Westphal mptcp_for_each_subflow(msk, subflow) { 120478962489SFlorian Westphal struct sock *ssk = mptcp_subflow_tcp_sock(subflow); 1205df00b087SFlorian Westphal u32 sseq = READ_ONCE(subflow->setsockopt_seq); 120678962489SFlorian Westphal 1207df00b087SFlorian Westphal if (sseq != msk->setsockopt_seq) { 1208df00b087SFlorian Westphal __mptcp_sockopt_sync(msk, ssk); 1209df00b087SFlorian Westphal WRITE_ONCE(subflow->setsockopt_seq, seq); 1210df00b087SFlorian Westphal } else if (sseq != seq) { 1211df00b087SFlorian Westphal WRITE_ONCE(subflow->setsockopt_seq, seq); 1212df00b087SFlorian Westphal } 121378962489SFlorian Westphal 121478962489SFlorian Westphal cond_resched(); 121578962489SFlorian Westphal } 1216df00b087SFlorian Westphal 1217df00b087SFlorian Westphal msk->setsockopt_seq = seq; 121878962489SFlorian Westphal } 1219